Reptiles of Yellowstone National Park
The 4 reptiles you can find at Yellowstone National Park, like the Bullsnake — sizes, diets, and whether you should worry.
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Reptile Bullsnake
Pituophis catenifer sayi
A big, harmless snake that fakes being a rattlesnake — hissing, flattening its head, and shaking its tail in dry grass — to talk its way out of trouble.
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Reptile Prairie rattlesnake
Crotalus viridis
A gray-green pit viper with a buzzing rattle, the only venomous reptile at several of the parks it shares with prairie dogs and badgers.
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Reptile Sagebrush lizard
Sceloporus graciosus
A small, slender, high-country lizard, the fence lizard's cousin, whose males flash blue belly and throat patches in a push-up display.
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Reptile Western terrestrial garter snake
Thamnophis elegans
A slim, striped snake found from stream banks to talus slopes across ten of these parks, and the most commonly seen reptile in several of them.